A: There are three main reasons for analyzing the causes of the cucumber's “waisting”:

1. The most direct reason is that there are too many melons, which affect the growth of stems.

2. Fertilizer and water management, especially the problem of fertilizer application, is more likely to cause the stems to become thinner and the leaves to turn yellow.

3. The sudden drop in temperature and the cloudy day lead to a further increase in the phenomenon of “waisting”.

The reason is found, then the symptom is treated. First, reduce the number of melons on the plants and promote the recovery of plant growth. The second is to strengthen the management of fertilizer and water, especially topdressing.

Remind the vegetable farmers that to strengthen the management of fertilizer and water should pay attention to: 1. Weather changes. Topdressing and watering should be carried out in fine weather. If it is rainy or sunny, even if the cucumber is slightly dehydrated or de-fertilized, it should be extended until the weather turns better. Otherwise, it is not conducive to plant growth and development. 2. Soil moisture. Because of its specific environment, cucumber has strict requirements for watering. Under normal circumstances, if it is not very dry, it should be controlled as much as possible. It is better to see the wet surface, the soil is not agglomerated, and there is no waste. When the soil surface has small cracks, water is poured, and combined with watering, the fertilizer is applied. 3. Rational fertilization according to the growth trend. Generally, the cucumber is planted in the slow seedling stage to control the watering, and the slow seedling to the early flowering stage is combined with the top dressing and pouring the small water. The result is timely and topdressing according to the seedling condition, and the water is fertilized, and the fertilizer and water are attacked. The application of high-potassium products cannot be unilaterally applied because the growth of the stems and the melons should be coordinated at the same time. The high-potassium water-soluble fertilizer and the balanced water-soluble fertilizer should be alternately applied, such as energy and fruit. After the temperature is lowered, it is necessary to supplement the roots of the biological fertilizer to maintain the root system. Only when the root system is strong, can the nutrients be better absorbed and the plants and fruits grow and expand.

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Poly Aluminium Chloride

Poly aluminium chloride (PAC) is a new type high efficiency inorganic polymer coagulant, adopting advanced manufacturing technique and quality raw material, show the features of low impurity, high molecula weight, and superior coagulating effect.

I. Poly Aluminium Chloride Properties

1. Its dosage lower than aluminum sulfate (based on Al2O3) and water treatment cost is lower than other inorganic flocculants.
2. The product can cause quick formation of flocs, big flocs formation and rapid precipitation. Its treatment capacity is 1.3-3.0 times of other inorganic flocculants.
3. It enjoys wide-range adaptability for different-temperature source water and a good solubility.
4. It is slightly corrosive and easy for operation.
5. The liquid product is suitable for automatic dosing. Furthermore, it will not block pipes over long-time usage.

II. Description

III. Poly Aluminium Chloride Application:

1. Its purifying effect on low-temperature, low-turbidity and heavily organic-polluted raw water is much better than other organic flocculant, furthermore, the treatment cost is lowered by 20%-80%.

2. It can lead to quick formation of flocculant (especially at low temperature) with big size and rapid precipitation service life of cellular filter of sedimentation basin.

3. It can adapt to a wide range of pH value (5−9), and can reduce the pH value and basicity after processing.

4. The dosage is smaller than that of other flocculants. It has wide adaptability to the waters at different temperatures and at different regions.

5. Higher basicity, lower corrosive, easy for operation, and long-term use of non-occlusion.

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